% APNIC found the following authoritative answer from: whois.afrinic.net

% This is the AfriNIC Whois server.
% The AFRINIC whois database is subject to  the following terms of Use. See https://afrinic.net/whois/terms

% Note: this output has been filtered.
%       To receive output for a database update, use the "-B" flag.

% Information related to '41.85.136.0 - 41.85.143.255'

% No abuse contact registered for 41.85.136.0 - 41.85.143.255

inetnum:        41.85.136.0 - 41.85.143.255
netname:        ALTRON-CLIENTFW-41-85-136-0-21
descr:          Altron Client Firewalls
org:            ORG-BSIL1-AFRINIC
admin-c:        JG24-AFRINIC
admin-c:        BS7-AFRINIC
tech-c:         BS7-AFRINIC
tech-c:         WB12-AFRINIC
status:         ASSIGNED PA
mnt-by:         BYTES-MNT
mnt-lower:      BYTES-MNT
mnt-domains:    BYTES-MNT
source:         AFRINIC # Filtered
parent:         41.85.128.0 - 41.85.159.255

organisation:   ORG-BSIL1-AFRINIC
org-name:       Altron TMT (Pty) Ltd
org-type:       LIR
country:        ZA
address:        ALTRON Campus
address:        20 Woodlands Drive
address:        Woodland Office Park Woodmead
address:        Gauteng 2191
phone:          tel:+27-11-205-7000
phone:          tel:+27-83-230-5094
phone:          tel:+31-45934388
phone:          tel:+27-82-657-7208
admin-c:        TVN2-AFRINIC
admin-c:        WB25-AFRINIC
admin-c:        LVDW1-AFRINIC
admin-c:        BS7-AFRINIC
admin-c:        JG24-AFRINIC
tech-c:         TVN2-AFRINIC
tech-c:         WB25-AFRINIC
tech-c:         ZH9-AFRINIC
tech-c:         LVDW1-AFRINIC
tech-c:         BS7-AFRINIC
mnt-ref:        AFRINIC-HM-MNT
mnt-ref:        BYTES-MNT
mnt-by:         AFRINIC-HM-MNT
source:         AFRINIC # Filtered

person:         BytesNet Support
nic-hdl:        BS7-AFRINIC
address:        P O Box 5905
address:        Halfway House
address:        Midrand
address:        1685
address:        South Africa
address:        Gauteng 1685
address:        South Africa
phone:          tel:+27-86-100-0443
fax-no:         tel:+27-11-205-7014
mnt-by:         GENERATED-TB7M52A022P4ICUXBEMWI8SGHBZM78ZS-MNT
source:         AFRINIC # Filtered

person:         Jon Gray
nic-hdl:        JG24-AFRINIC
address:        241 Third Road
address:        Halfway Gardens
address:        Midrand 1685
address:        South Africa
phone:          tel:+27-11-205-7677
mnt-by:         GENERATED-H63KBHXTYTR1GWGC7I7SJQMFV7KXZ4L9-MNT
source:         AFRINIC # Filtered

person:         Wickus Botha
nic-hdl:        WB12-AFRINIC
address:        ALTRON Campus
address:        20 Woodlands Drive
address:        Woodland Office Park
address:        Woodmead 2191
address:        South Africa
phone:          tel:+27-11-205-7957
phone:          tel:+27-82-942-1999
mnt-by:         GENERATED-YYRSINJUYWXXWKSFVWI0CZO1ZFRXU2TO-MNT
source:         AFRINIC # Filtered